Please read.. And help

Katie
I've been having strange feelings in my stomach like bubbles popping :/ as well as that a really bad ache in my back whilst working (I work at a desk all day and never had back ache before) and then today everytime I have either stood up or moved off after standing still I have felt dizzy.. I don't won't to test yet as don't want to disappoint myself, Glow is saying I can test tomorrow but is it best waiting until my AF is due?